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An AT&T logo is seen atop a store in Beverly Hills, California in this August 31, 2011 file photo. AT&T Inc T.N posted quarterly revenue on July 23, 2013, that was ahead of Wall Street expectations as it added wireless subscribers. REUTERS/Danny Moloshok/Files (UNITED STATES - Tags: BUSINESS TELECOM

AP

AT&T employees sort through tangled phone lines as they clean up in a tornado-ravaged neighborhood Tuesday, May 21, 2013, in Moore, Okla. A huge tornado roared through the Oklahoma City suburb Monday, flattening entire neighborhoods and destroying an elementary school with a direct blow as children